You can clear your Amazonite under lukewarm running water for a few minutes, then dry it with a towel and put in the morning sun to charge for about 30 minutes. Avoid drastic temperature changes with Amazonite and make sure it does not stay in the Sun for too long because it may crack or its color may change.

If by resetting you mean that you or someone else had programmed Amazonite for a specific purpose and now you wish to change this program, you may find this article helpful: